Beach · Dukes County · MA
Is Ocean @ Edgartown Great Pond safe to swim?
Recent heavy rain may have spiked bacteria since the last clear sample.
Updated July 19, 2026 · Massachusetts beach program (EPA BEACON)
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What's in the water at Ocean @ Edgartown Great Pond right now
As of July 19, 2026, Ocean @ Edgartown Great Pond in Dukes County, Massachusetts carries a swim caution. Blue-green algae are not currently monitored at this water. No fecal-bacteria advisory is posted (state beach program). Rainfall over the past week totaled 4.3 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Ocean @ Edgartown Great Pond
Ocean @ Edgartown Great Pond is a lake in Dukes County, Massachusetts. Blue-green algae are not currently monitored at this water.
Blue-green algae (cyanobacteria) blooms are most common from midsummer into early fall, when the water is warm, calm, and rich in nutrients from runoff. They can produce toxins that make people sick and can be rapidly fatal to dogs, so skip water that looks green, scummy, or like spilled paint, and keep children and pets out of it.
Frequently asked: swimming in Ocean @ Edgartown Great Pond
- Is it safe to swim in Ocean @ Edgartown Great Pond right now?
- Ocean @ Edgartown Great Pond carries a swim caution today. Blue-green algae are not currently monitored at this water. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.
- Does Ocean @ Edgartown Great Pond have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Ocean @ Edgartown Great Pond. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Ocean @ Edgartown Great Pond?
- No bloom is detected at Ocean @ Edgartown Great Pond today, but dogs are much more vulnerable to blue-green algae than people, and blooms can form within hours. Always keep dogs away from water that looks green, scummy, or discolored, and rinse them off after swimming.
- How many Massachusetts lakes and beaches have swim advisories today?
- Today, 5 Massachusetts waters are under a swim advisory and 229 more warrant caution, out of 608 monitored waters SwimZone tracks in the state.
- How is Ocean @ Edgartown Great Pond's water quality measured?
- SwimZone builds this read from EPA CyAN satellite imagery for blue-green algae, official beach and fecal-bacteria advisories where a program monitors Ocean @ Edgartown Great Pond, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.